Updating Unity version
Updating Unity version

There's confusion with 2018.3+ means it supports 2019 as well. clarifying
killerantz/HoloToolkit-Unity,killerantz/HoloToolkit-Unity,killerantz/HoloToolkit-Unity,DDReaper/MixedRealityToolkit-Unity,killerantz/HoloToolkit-Unity